Bergen Intrepid Magnum Tazer, Manual, Page: 64 / 88

Slide the tail gearbox input shaft into the end of the long TT shaft and
secure with a collar and ONE 3X3 setscrew. You now have a complete
TT assy, however the next steps are VERY important to a reliable TT
drive.
Using a #46 drill bit (small enough to not damage the threads in the
collar), pick ONE setscrew hole in EACH collar (4 places) and drill
through the shaft going deep enough to create a divot in the shaft
inside. The pic shows what the divot should look like.
At each point that you drilled, install a 3X3 setscrew with loctite,
ensuring that the setscrew sits down into the divot. Install 3X3
setscrews into the remaining threaded holes, not forgetting to remove
and loctite the ones installed initially. Your TT shaft is now complete!!